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1 light, until most of the screen holes get filled in

Ok good, give it another week, and then lightly clean the screen in your sink, then see how it is in another week after that.

Keep the same light, so you can see what growth pattern fills in. Send a photo of the growth before cleaning.

Welcome. This is a Rain2, not 4. Sounds like you have the four-light option.

There is way too much light. Brush everything clean (including tray and slot), and only plug in 1 light on the top, for...